Coffee maker



March 18, 1952 L, RGESS 2,589,221

COFFEE MAKER Filed July 12, 1947 10 Sheets-Sheet l 13 r r 37 110 14 i12! I 100 JNVENTOR. 4 292 March 18, 1952 L. BURGESS 2,589,221

COFFEE MAKER Filed July 12, 1947 10 Sheets-Sheet 2 INVENTOR.

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L. BURGESS COFFEE MAKER March 18, 1952 10 Sheets-Sheet 3 Filed July 12,1947 fnvmzor March 18, .1952 L. BURGESS 2,589,221

COFFEE MAKER Filed July 12, 1947 10 Sheets-Sheet 4 170 I 4 169 /E,: a u198 124 171 J F g L. BURGESS March ,18, 1952 COFFEE MAKER l0Sheets-Sheet 5 Filed July 12, 1947 March 18, 1952 BURGESS 2,589,221

COFFEE MAKER Filed July 12, 1947 10 Sheets-Sheet 6 WW V 41 M I 4; I J II 1 44 .f w I156 I 43 1 i 529 1H] 50 W? I 42 T: 92? 92 47 March 18, 1952L. BURGESS COFFEE MAKER Filed July 12, 1947 10 Sheets-Sheet 7 March18,1952

Filed July 12, 1947 L. BURGESS COFFEE MAKER 10 Sheets-Sheet 8 INVENTOR.

March 18, 1952 BURGESS 2,589,221

COFFEE MAKER J Filed July 12, 1947 10 Sheets-Sheet 9 INVENTOR March 18,1952 L. BURGESS 2,589,221

COFFEE MAKER Filed July 12, 1947 10 Sheets-Sheet 10 INVENTOR.

Patented Mar. 18, 1952 UNITED STATES PATENT OF Fl CE 2,589,221; corres-Mifimit- Louis Burgess, Jersey. City, N. J. Applicationiliily-lz, 194v,serial-No. 760,599

13.Gla ims. 1.

The present invention is an improv'ementiupon th'e cofiee makerdescribed in my. U. S.- Pat. 2,159.210 of March 7 .21939. I 4

The machine shown-and described inmy: said priorpatentin thecompleteform in. which it isadapted for restaurant and similarusezincludes the' 'i'o llowingi A. A=tank from which a predeterminedamount the =mixtu-re is separated into a clarified coffee beverage whichoverflows theupperflip. or "rim of "the centrifuge and aresidue .of'ic'offee grounds which is ejected from said. cen-trifuge" after saidcentrifuge has stopped.

'E. A collector ring encircling rtheroverflow lip. or rilri' oithecentrifuge by. which the' cla'rified cofieebeverage l-is collected andfrom: which it is conducted toa suitable receptacle.

F. An': automatic timingv device: whereby: the steps invo'lved in theoperation of the machine are carried through in sequence: wheneverthemachine is: set fin-operation.

The: improvements .to this -machine constituting :the present inventionwill be iullvunderstood from -the following description read in conjunction with the :drawingain which:

Fig. 1 iseside elevation of my; improved cQiIee maker; with certainparts in section;

Fig. 2"isa' plan view thereof, with certain parts I Fig. 3iis across=sectlon through ad'etail of construction;.

Fig: 4:.isa' vertical section alongx-the-plane IV-IVoi'rFig; 1;

Fig. 5? is a: vertical section=along-.-plane V'V of Fig. '1;

Figs; 16,- ..7. .8 and .9 Y are-various detail -views-of parts of theconstruction "shown :in Fig. 5

Figzl is aside view of apart of the construction shown in Fig.

Fig. 11 is a-plan view of theshoWiQ Qf Fig.

Fig? 12 is a; broken cross-sectional view-along Fig. 13 is ahorizontalsection along ;plane xIII XIII-of Fig. 1;

14" is-apartial sectionalview along plane XLV-XIV of Fig. 13;

Figll'fiis a partial: sectional view along plane XYXV- of Fig. 13;

Fig; 16 is as'ctional view showing a detailof construction Fig. l7 is 'aview partly in diametralsection of the -dispenser shownin Fig. 1;

Fig. 18 is a full bottom view of the showing-of Fi 17:

Fig. 19 is a perspective view of part of the showing of Fig. 17; I

Fig. 20 is a rear View of the timing. device according. to my invention;

Fig. 21 is a iront view thereof;

Fig. 22 -is a right side view thereof;

Fig. 23 is'a left side view thereof;

Fig.24 is a plan viewofthe timingdevice of Figs: .20' to 23, showing inaddition certain other details. of construction;

Fig: 25 is a vertical section along plane XXV-XXV- of Fig. 1;

Figs. 26', 27,28, 29, 30, 32 and 35 are detail views'showingcorresponding positions of a number of-cams which are part of the timingdevice .shownin Figs. 20-24 inc.;

Fig. .31 is a top. view of part of the showing of Fig. 30;.

Fig. 33 is a left side View of Fig. 32;

Fig. 34 is -a-detai1 view with certain parts removed-of part of theshowing of Fig. 32-.

Fig. 36 is awiringdiagram for my machine.

The parts of the machine are'assembled on base l (Figs. 1, 2 4 and 5)supported by suitable legs 2. Tank -3 is mounted on one end'of' thisbase and comprises verticalshelll carrying at its=upper edge flange 5 towhich cover 6 is detachably securedby screws. Water enters thetank-through pipe [0 (Figs. 1 and 2) communicating with a water pressuresource (not shown inthe drawing). Flow into the interior of thetankiseontrolled by-needle valve I 3 (Figs. 1;.2, 4 and 13 )ldischarginginto tube I4. Theopera- .tion of valve l3 is controlled-by fioat I6operating through arm [Band push rod I5 in such a manner tha-t thisvalve is closed when the level of water inthe tank reaches apredetermined levelindicated-by I! (Figs. 1 and 4). Water level gauge ofpart of the showing .g1ass -l9'(Fig. 1) communicating at top with theopen "atmosphere provides convenient means to check-this level. Wheneverwater is withdrawn from thetank, float l6 falls slightly, push rodISistherebyraised and water-flows intothe tank .fromtube l4 :viapipe 10until the predetermined level; l-l is reached. Chamber 2| is open at the.bottomto receive heat from burner 22 (Figs. land 4) l andiat its top.communicates with identical stacks 2'3 and 24 (Figs. 1, 2i .4 and 13).The

function of chamber 2| is to transfer the heat delivered by burner 22 tothe water in the tank, while stacks 23 and 24 carry 01f the gaseouscombustion products of the burner. Burner 22 receives gas through pipe25 (Fig. 1). The amount of gas is controlled by bulb or thermallyresponsive element 26 located in the lower part of tank 3 directly underthe outlet of cold water admission tube l4 and operating throughthermostat 21 (Fig. 1) so that whenever cold water is admitted into tank3 or the water in the bottom of said tank otherwise falls below theboiling point, the burner flame increases. The dimensions of identicalstacks 23 and 24 are such that enough heat is communicated to the waterin the upper part of the tank to keep it at the boiling temperature eventhough the water in the lower part of the tank is temporarily below theboiling point. This insures that some steam will be continuouslygenerated in the upper part of tank 3, the use and application of whichwill be described hereinafter. When the water in the lower part of tank3 is at the boiling point thermostat 21 (Fig. 1) cuts down theburnerfiame. The bypass of thermostat 21 is adjusted for minimum flame,such that even when the burner is cut down the necessary extent ofboiling and steam evolution in the upper part of tank 3 will 'bemaintained.

Up to this point the means described is for the purpose of maintaining avolume of water in tank 3, of maintaining at least the upper part ofthis water at boiling temperature, and or maintaining controlledevolution of steam therefrom.. In

the operation of the machine, a predetermined amount of water isabstracted from the upper part of tank 3 when the machine is operated.

. The equipment for this purpose includes container (Figs. 1, 2 and 4)located in the upper part of tank 3 below water level l1 and vented intothe space above said water level H by pipe 3|. Screw 29 secures pipe 3|to shell 4 of tank 3 '(Fig. 2). Details of the mechanism by whichcontainer 30 is alternately filled from tank 3 or discharged to a pointexternal to' said tank appear from Figs. 1, 3 and 4. This comprisespipe: 28' extending at one end into container 30 (Figs.

1 and 4) and at the other end into extension 29 -of valve 32. Theplunger 33 of said valve is of. the' combination slide and poppet type,the side wall fitting snugly bore 34 of valve 32 (Fig. 3),v while thefrustro-conical surface 35 makes liquid-tight contact withfrustro-conical seat 36. The plunger is actuated by push rod 31operating through stufling box 38. When the plunger is inthe positionshown in Fig. 3, container 38.

(Figs. 2 and 4) is in free communication, via

pipe 28, with outlet-39 and the contents of con- :tainer 3!) flow out oftank 3. When, however,

plunger 33 is in its lowest position, outlet 39 is jblocked by thepoppet valve consisting of surface 35 and seat 36, now in liquid-tightcontact,

whereupon water flows from the interior of tank 3 through port 40 (Figs.1 and 3) and through "the bore 34 of valve 32 back'into container 38.

The dispenser 4| which delivers a predetermined amount of ground roastedcoffee is illustrated in Figs. 1, 2, l7 and 18. The dispenser. comprisescylindrical bore 42 and integral therewith fiange 43 and rim 44 whichhold glass cylinder 45. The cylinder is surmounted by the removablecover 46. The bottom of cylindrical bore 42 is provided with floor 41.Upstanding shaft 48 is journaled in the exact center of this floor.Pinned to this shaft is hub 49 which carries eight radially disposedvanes 58 (Figs. 2 and 17). These vanes define eight pockets (Fig. 2)which by their rotational movement operate to progressively bringcharges of coffee over discharge port 5| in floor 41 (Fig. 18). Coverplate 52 (Figs. 2 and 17) secured to cylindrical bore 42 (Fig. 1'1)overlays port 5| to prevent coffee from running out of said port (Fig.18) except as transported by vanes 58 to a position overlaying saidport. To the upper part of shaft 48 there is pinned hub 55 (Figs. 2 and17) hearing three sweeps 56 which sweep the upper surface of cover plate52 to prevent accumulation of ground coffee thereon.

Dispenser 4| additionally requires some means for moving hub 49 andattached vanes 58. This means includes gear 59 (Figs. 1'? and 18)splined to the lower end of shaft 48. This gear is periodically engagedby av hook 6| journaled at 62 to arm 63 of bracket 64. Spring 60 (Fig.18) serves complete revolution, but when shaft 65 and therewith bracket64 move in the reverse direction, hook 6| will merely slide over thebeveled teeth of gear 59 (Fig. 18) without moving hub 49 (Fig. 17). Inpractice, I find it highly advisable that this movement be carried outgradually and progressively throughout the major part of the operatingcycle of the machine. This being the case, it is evident that unlesssuitable provision were made, the coffee in the pocket, formed by two ofvanes 58, moving over discharge port 5| (Figs. 2, l7 and 18) would fallcontinuously out through said discharge port. Inasmuch as the coffeemust however be discharged at the commencement of the operating cycle,suitable means is incorporated to hold this charge of coffee in thedispenser until required. This means includes plate 18 (Figs. 6 and 7)pivoting about ginning of the machinels cycle as will be-hereinafterexplained. When bracket 64 commences to return', shoulder 16 (Fig. 18)of hook 12 is engaged by dog 11 resiliently pivotable about pin 19against the action of sprin 18 one end of which is connected to arm 8|of dog 11 and the other to stub 82 provided on the bottom of floor 41.Hook 12 is thereby forced out of engagement with pin 1| and plate 10returns to closed position, covering port 5|, under the influence ofspring 83, one end of which is connected to pin 84 on arm 85 of plate 18while the-other end is connected to stud 86 protruding downward fromdispenser floor 41. The further movement of bracket 64 forces dog 11 outof engagement with shoulder 16, thereby freeing hook 12. Plate 18 issupported by rigid bar 89 pivotally carriedby the lower end of shaft 48.

Some of the finer grades of coffee manifest a tendency to-sticktogetherand may for this reason not be completely discharged from'thespace overlaying port even though plate hasuncovered said port. Thisdiificulty is, however, overcome by upwardly projecting teeth 90'and8l(Fig. 17) carried by'plate I0, which teeth project up into the spacetraversed by vanes- 50and rip and dislodge the coffee above dischargeport 5| so that it is fully discharged; A perspective view of one suchtooth is. shownin Fig. 19; A'sis evident from Fig. 6, vanes 50 defineslots or cut-out portionstz which enable vanes 50 to clear teeth 90, 9Iintheir progressive rotational movement.

The dispenser AI is positioned by bracket 99 (Fig. 1') embracingcylindrical bore 4260f. dispenser 4|, the ends of said bracket 99 beingsecured to shell 4 of tank 3 (Fig. 1) The dispenser is thus firmlysecured in position .in the machine.

Thatpart of the machine by which .the predetermined volume of coffeedelivered by dispenser H. and the predetermined volume of waterabstracted from tank 3are commingled to'form .a mixture of hot water andground roasted coffee appears in Figs. 1, 5 and 13. Referring to thesefigures, this part of the device comprises mixer I00 consisting of conebottom receptacle .IOI surrounded by casing I02and associated means foradmixing the coffee and water. Discharge outlet 51 01 the dispenser islocated directly above the mouth of receptacle .IOI so that the chargeof ground-roasted coffee delivered by the dispenser falls directly intosaid receptacle. The predetermined volume of water abstracted from tank3 bymeans hereinabove described is delivered via valve 32 intoreceptacle I 0] by spout I03 (Figs. 1, 5, 6 and 13). The hot Waterissues from spout I03 in a well defined stream of considerable velocitythrough orifice. I04 (Figs. 5 and 6). This orifice may be threaded tothe spoutso that orifices of different capacity may be substituted forone another if it is desired to change the volumetric capacity of themachine. As indicated in the drawing (Figs. 5, 6 and .13) this streamfrom orifice I04 is discharged at a non-central angle 2 intermediatebetween vertical and horizontal and on striking the surface of theliquid already delivered into receptacle IOI it imparts a rotationalmovement thereto while simultaneously beating down into the liquid anyground coffeefioating on the surface thereof.

This angle is preferably between 30 and 60 with reference to thehorizontal, for maximum efiiciency. .As .a result the coffee and waterintroduced into receptacle IOI are thoroughly and efiiciently commingledby the velocity of the water introduced and without resort to amechanical mixing device.

Suitable means is provided for discharging the mixture from receptacleIOI after it has remained in the receptacle a suitable predeterminedperiod of time. This means comprises a valve of special and novelconstruction (Figs. 5 and 9). The mixer discharge outlet I05 iscentrallylocated in the cone bottom I06 of receptacle IOI (Fig. 5). Thisoutlet may be closed by the frustro-conical end of poppet-type plug I01.Referring to Figure 9, it can benoted that plug I0'I in turn defines asmall outlet or discharge orifice I08 which may be closed by conicalplug I09 secured to the lower end of push rod 0. These parts are held inalignment by bore I I I formed in the upper end of plug I 01 in whichbore push rod I I0 reciprocates. The central portion of said plug I01 iscut away leaving only two posts II 4, thus permitting free access of themixture of water and coffee to orifice I 08. When the valve is in theposition illustrated in Fig. 5, i. e., with push rod H0 in depressedcondition, discharge outlet I 05 is blocked by plug I0! and orifice I08is blocked by plug I09. In this position the mixture of coffee and wateris of course held in receptacle IOI. At the .expiration of apredetermined period of time a controlled and uniform stream of .themixture is supplied to the centrifugal separator to be hereinafter morefully described. For this purpose, the pressure 'on push rod I I 0 isreleased whereupon spring II5 pressing against collar IIB pinned to rodIIO forces upwardly said rod and plug I09 carried thereby, therebyuncovering orifice I08. This position of the valve is shown in Fig. 9.The diameter of this orifice and of the rundown tube II'I (Fig. 5) areinterrelated. If the rundown tube is too small the requisite rate offiow cannot of course be maintained and conversely if it be too large itwill not carry a solid column of liquid, whereupon suction on orificeI08 will be lost :and the rate of flow out of receptacle IOI will falloff rapidly with diminishing level of the material in receptacle IOI.Within these limits the rate of fiowfrom receptacle I0'I is a functionof the total heighth of liquid in said receptacle and said .rundown tubeII 1 and is therefore only limitedly affected by the drop in level inreceptacle .IOI.'

Forthe purpose of establishing the diameter of the orifice and of theoutlet tube the following procedure is recommended. Having establishedthe dimensions. of the mixing receptacle. and the length of outlet tuberequired to carry *themixturefrom thereceptacle into the base of thecentrifuge, an orifice is provided in the lower end of the outlet tube.Being so mounted the orifice will at all times be operating under afullhead of liquid and the rate of v.fiow will therefore be controlled bythe size of the orifice and by the head. Under these conditions, thesize of the orifice can be varied until the desired rate of fiow out ofthe mixing receptacle is obtained. In this way it is possible toestablish approximately the correct diameter of orifice, and the size oforifice having been so established the orifice is now moved from thelower end of the outlet tube to the upper end of the outlet tube. Twoprocedures are now available for determining the correct size of theoutlet tube to be operated in conjunction with the size of the orificeso established. In one procedure an outlet tube of transparent materialsuch as glass may be temporarily provided and tubes of varying diameterare substituted until with increasing diameter it is found that the tubewill not carry a solid column of liquid but that the column will breakand will at least partly dis.- place'the liquid in the tube, therebyreducing the hydrostatic head upon the orifice. The outlet tube to beadopted in practice should approach the maximum diameter at which asolid column of liquid is obtained under these conditions therebyinsuring a uniform discharge of the mixture from the mixing receptacleinto the centrifuge coupled with the maximum rate of discharge of theflush water hereinafter referred to. In the alternate procedure anoutlet tube of metal may be used and tubes of varying diametersubstituted until a diameter is reached at which the outfiow from themixing receptacle through the orifice is not uniform and sustained butpro contra falls off sharply with the reduction of liquid level in'themixing receptacle. Based on these observations the tube to be adoptedand installed should approach the maximum diameter. at which the rate ofoutflow from the mixing receptacle is a function of the total headwithin the mixing receptacle and the outlet tube and is thereforerelatively unaffected by a reduction in liquid level within'the mixingreceptacle.

At the complete end of the operating cycle it has been found necessaryto flush out receptacle IOI and at this time and for this purposesquirts of water are tangentially introduced (Figs. 5 and 13) by nozzlesII8. These nozzles are bored in small turrets II9 spun into the innersurface of the side wall of receptacle IOI. A detail view of one suchnozzle is shown in Fig. 8. Flush water is carried to said nozzles byannular ring I20 set in the top of mixer I (Fig. and the flush water iscarried into ring I by tube I2I (Figs. 1 and 5). The means for thesupply of fiush water to tube I2I is described hereinbelow. During thisstage of the operating cycle free discharge from receptacle IOI isdesirable and this is accomplished by further lifting push rod IIO sothat plug I01 is unseated and the liquid passes out of receptacle IOIthrough the full opening of discharge outlet I05 (Fig. 5).

Inasmuch as tramp material occasionally finds its way into the dispenserand since such tramp material might plug orifice I08 and therebydisturb'the working of the machine, said orifice is surrounded byfrustro-conical screen I22 (Fig. 5).

This screen is of perforated metal, the perforations being approximately1% inch in diameter on /4 inch centers. It operates to prevent trampmaterial finding its way to orifice I08 and also functions as a guidesurface for plug I01.

The construction of the centrifugal separator and? ancillary parts isshown in Figs. 5, '1, 10, 11 and12. The centrifuge I23 (Fig. 5)preferably of chromium steel or stainless steel, comprises upper tubularsection I24 which terminates in inwardly projecting overflow lip I25 andlower tubular section I26 of a diameter greater than section charge fromthe overflow lip is so great as to introduce cloud into the beverage. Bythe special'form of centrifuge shown in Fig. 5, the accun j'ulation inthe base of the centrifuge is pro vided for and any tendency to plug asthe re"- sult of the use of too coarse a grind is obviated, while theupper tubular section I24 of the centrifiige is freed of the load of thecoarser particles and a higher clarification efficiency is maintainedwith minimum peripheral velocity of discharge and minimum cloud. Inpractice, the centrifuge is started in rotation so that it comes to fullspeed before plug I09 lifts and orifice I08 is uncovered. Thereafter themixture of ground and extract runs at a uniform rate through mixeroutlet I05 to tube 1 and is diverted horizontally from the lower end oftube II1 by spinning saucer I30.

Referring to Figs. 10, 11 and .12 for details of this saucer, it can benoted that the circumference of this saucer is provided with'a series ofvertical teeth I31. These teeth act as an impeller ring to increase thevelocity with which the mixture of ground coffee and water issuing fromoutlet tube H1 is thrown horizontally into lower tubular portion I26 ofcentrifuge I23. In

.order to prevent coffee grounds from being retained in said saucer bythe inner surfaces of said teeth, said surfaces are inclined downwards,preferably forming a continuation of the radial 5 bevel of said saucer,and may in addition also be provided with lateral bevels as shown in thedrawing (Fig. 11 and 12). Saucer I30 is carried by two posts I3I (Fig.10) forming an upward extension of discharge tube I28, thus leaving afull opening for discharge purposes. The mixture undergoing separationaccumulates in the centrifuge in tubular form. The thickness of thistubular body is determined by the inner edge of overflow lip I25. Asstated, the larger particles are thrown out in lower tubular section I25of centrifuge I23 and with continued introduction of fresh mixture thepartially separated mixture is displaced upwardly into upper tubularsection I24 of the centrifuge. The mixture introduced into thecentrifuge may contain some froth and some particles which haveassociated air or gas bubbles. Such froth and particles might move upalong the inner wall of the centrifugal column of liquid but arerestrained from so doing by a series of, for instance, four bafiles Iprovided in upper tubular section I24 of the centrifuge (Fig. 5).Referring to Figure '1 for a detail view of one of these bafiles itisnoted that they are peripherally cut away to form concentric slots I36through which the mixture passes adjacent the inner wall of uppercentrifuge section I24, and are provided with central opening I31 toclear rundown tube II1 (Fig. 5), but are otherwise imperforate so thatmaterial cannot flow telescopically up the centrifuge. The bafiies aresecured in position in any suitable manner. When centrifuge I23 isplaced out of rotation (by means hereinafter to be described) the coffeegrounds discharge by gravity into discharge tube I'28 and thence intowaste pipe I33 (Fig. 5) Waste pipe I33 is supported from base -I byfitting I34 (Figs. 1 and 5). The centrifuge is driven by motor I92through belt I39 (Fig. 1) and pulley I40 (Fig. 5).

As mixture continues to flow into centrifuge I23 there is a continuousupward displacement of same into upper tubular portion I24 of thecentrifuge and clarified beverage is thrown off from the top surface ofoverflow lip I25. It will be noted (Fig. 5) that the outer peripheraldiameter of lip I25 is less than the bore of the upper portion I24 ofthe centrifuge, thereby reducing the peripheral velocity of discharge.The clarified beverage is caught in the annular trough 55 formed bycollector ring I4I (Fig. 5). This collector ring is provided with bossI42 by which it is secured to cylindrical casing I43.- By reference' tothe partial'view of collector ring I4I contained in Fig. 15', it will benoted that the 80 beverage discharges from said collector ring .throughboss I42 into accumulator I44 by means of spout I45. This spoutdebouches into thimble I48, forming a hydrostatic seal, the function ofwhich will be hereinafter considered.

Accumulator I44 (Figs. 1, 2, 13, 14 and 15) comprises spaced concentricglass cylinders I41 and I48 (Fig. 14) closed by top and bottom endplates I49 and I50, respectively, held together by rods I5I. Faucet I52(Figs. 1, 2 and 13) is pro- 70 vided for drawing off the coffeebeverage. Bracket I53 (Fig. 14) extends downwards from .end plate I49 tosupport thimble I46. Cover plate I 54 (Fig. '13)'s1idableparallel to top;end plate I40 provides access to the accumulator-for 15 cleaningpurposes. Float I55 vertically displaceablein housing I56 (Fig. 14) isresponsive to the liquid level within said accumulator. This float isprovided with vertical guide pin I51, rigidly attached thereto. Theoperation of this float can be more easily understood by referring tothe partial cross-sectional view afiorded by Fig. 16. When the level ofcoffee beverage in accumulator I44 drops below the predetermined level,float I55 and vertical guide pin I51 rigidly attached thereto (Fig. 14)move downwards and collar I58 (Fig. 16) borne by pin I51 (Figs. 13 and1(3) presses down on end I59 of channel member I60 (Fig. 16) pivotedabout pin I6I secured in housing I62. End I63 of said channel member isthus raised, closing microswitch I64 (Fig. 1) by means of chain I65(Figs. 1 and 16), thus maintaining the electrical circuit of my machineclosed, as will be describedhereinafter below. Whenv cofiee beverage hasaccumulated up to the-predetermined level iii-accumulator. I44 float I55rises, the pressure on end I63 of lever I60 is released and microswitch'I64 is allowed to open. -Cam I66 (Figs. 13:;and 16) is arranged inhousing I62 and provided with handle I61 to turn said cam to causejit'tobear down on lever end I 63, thus providing-manualoperating means forthe control of microswitch I164 (Fig.1).

Centrifiuge- I23 is journaled in bearing I69 (Fig. This bearing definesannular space I10, closed by annular ring I68, into which space ,oil forlubrication isintroduced-through oil hole I1I connecting with force-feedlubrication line I12. The OiliXIlOVGStO the bearingsurface through holeI13. Any oil thrown off from the upper surface ofl'iearing I69isdefiectedbyapron I14 into annular trough I15, from where it dischargesthrough. port I16 onto shelf I11 secured'to the sidewallof-thecentrifuge and serving to deflect the oil. into annular trough I18.Similarly any oil passingaway fromthe lower surface of bearingI69 islikewise deflected by said shelf I11 into said annular trough I18.Overflow .I8I communicating with said trough. serves to return theollvia line I82 to the oil reservoir 351 (Fig. l) to be hereinafterdescribed. The downward thrust of the centrifuge'is taken by collar I 83(Fig. 5') secured to the side wall of the centrifuge and riding on the:upper surface of bearing I69. This collar :also: carries dependingskirt I84, the purpose of which will be'hereinafter described.

After the mixture formed in receptacle IOI has all flowed intocentrifuge I 23, a batch of plain water 'at about-theboiling point fromtank 3 delivered by valve 32 into receptacle I0| through spout I03. Thiswater flows into centrifuge I23, thereby displacing anyextract-remaining. therein at this time, and insuring that when thecentrifuge is stopped, it will not containbeverageficoffee and thatthere will not be a loss of yield as the result of beverage remaininginthe-centrifuge'.

When these operations are concluded, centrifuge I23is-abruptly-stoppedbymeans of brake 301 (Fig. 1) to be hereinafterdescribed. In this case the residue of grounds and water remaining in.the centrifuge continues tozrotate for a few seconds until itsvmomentumihas become dissipated. .Thisascours:and-cleans the innersurface of centrifuge I23 an'dassoon as the. momentum has beendissipatedinthis .manner the mixture flows out :of the centrifugethroughdischarge tubeyl28za'nd outof theapparatus through wast pipe-I33- Assoon-as this has taken place, jets of hot water :are :discharged againstthe inner walls; of

receptacle IOI and of centrifuge I23 thereby completing the cleaningoperation.

The means for the accomplishment of this cleaning operation comprisescoil I surrounding flue 2| in tank 3 (Figs. 1, 4 and 13) and branchingoff from water inlet pipe I0 below needle valve I3. The other end ofcoil I90 communicates via flush control valve I9I (Figs. 1, 2', 4, 5 and13) with pipe I93. Pipe I93 communicates in turn with conduit I94 (Fig.5) within casing I 02 of mixer I00, which conduit terminates in chamberI91 concentrically arrang d about mixer discharge outlet I05 anddelivery tube II1. Flush tube I96 extends downwards from chamber I91, soas to provide an annular space concentrically surrounding rundown tubeII1. This annular space is sealed off slightly above teeth I32 of saucerI30, and flush tube I96 s provided with a multiplicity of orifices I93'orming outlets for the flush water. Tube I2I providing flush water vianozzles II8 to receptacle IOI, as described above, branches off frompipe I93. This tube is provided with U-bend I99 to provide a hydrostaticseal in said tube. Thus when flush control valve I9I (Figs. 1, 4 and13') is actuated by means hereinafter to be described, water which hasbeen heated in coil I90 to 100 C. and which is under the full pressureof the main water supply, for instance the munipical water system,discharges through orifices I98 and nozzles- I I8 (Fig. 5) therebyflushing out receptacle IOI and centrifuge I23 respectively.

As hereinbefore stated, burner 22 (Figs. 1 and 4) heating the water intank 3 is so controlled. thermostatically, that some boiling is alwaystaking place in the upper part of tank 3 with consequent generation andevolution of steam. This steam passes downwardly through vertical pipe20I (Figs. 1, 2 and 13) and thence via horizontal pipe 202 into casingI02 (Figs. 2, 5 and 13). Some of the steam condenses to maintainreceptacle I0 I, centrifuge I23, collector ring MI and associated parts(Fig. 5) at 100 C. thereby insuring efiicient operation regardless ofthe standby periods and also sterilizing centrifuge I23 and collectorring I M. One part of the excess steam moves downwardly through the boreof centrifuge H3 and out of the apparatus through discharge tube I28 andwaste pipe I33 (Fig. 5). Any air that may have been originally in thecentrifuge orcarried into it from the mixture theretofore separated isthus displaced by steam, thereby eliminating cloud in the finishedbeverage which would otherwise result from air in the system. The steamis prevented from flowing into the centrifuge bearings by dependingskirt I84 (Fig. 5), which operates as a hydrostaticseal, the water forthis seal being supplied by the condensation effected at casings I02 andI43. Whenever centrifuge I23 is started this Water is thrown out bycentrifugal force and flows through drain 204 and conduit 205 towaste'pipe I 33. Another part of the excess steam passes via conduit 206(Figs. 5 and 15) into the annular space defined by glass cylinders I41and I48 of accumulator I44 (Fig. 15), thus providing a steam jacket forthe coffee beverage contained within said accumulator. Condensate flowsto waste pipe I33 throughdrain 208 (Fig. 14) and pipe 205 (Fig. 5). Thehydrostatic seal provided by thimble I46 (Figs. 14 and 15) preventssteam passing into the central portion of accumulator I44 through spoutI45.

Having described the constituent parts of the machine by which thebeverage is produced-I now describe the control ortimerbywhichthese-constituent parts are operated in the correct tem-- 12manually or by accumulator float 155, and hence projection 243 climbsfrom surface 242 onto surfface 244, mercury switch 234 will be carriedto "the on-circuit position and motor 221 will conspring 241.

time in operation until the entire cycle has been completed and the camrider 241 is returned again down onto surface 242 by the tension of Oneend of said spring is connected to rocker 246 and the other end to panel233'. At this'point if switch 164 (Figs. 1 and 36) is open, timer motor221 and the apparatus come to a complete stop.

are suspended from the underside of base 1 (Fig.

1). These uprights are mounted on reservoir cover'plate 362, 'and arefurther laterally supported by cross-plates 216 and 211. Motor 221 iscarried laterally by cross-member 236 secured to legs 2 (Fig. 1). Camrider shaft 231 is likewise journaled in holes bored in uprights 228 and229. ported on vertical panel 233, this shaft serving as The next stepin the operation of the apparatus is effected by cam 249 (Figs. -24). Adetail'view of this cam is shown in Fig. 26. This cam carried byjackshaft 226 controls the operation of the mixer outlet valve 105 shownin Figs. 5 and 9. When timer motor 221is started projection 250 of rider251 carried by shaft 231 Shaft 232 is secured in brackets 231 supclimbsto the surface 252 of cam 249, thereby lifting push rod 253. This pushrod is connected via link 254 (Fig. l) pivoted on bracket 255 sepivotfor mercury switches 234 and 235 the purpose of which is hereinafterexplained. Panel 233 is cut-out to permit the pivoting of theseswitches. Trough 236 is supported by staybolts 218 and 219 securedbetween uprights 228 and 229. This trough (Figs. 1 and 20-24) functionsto retain a bath of oil or grease into which the cams dip and which,therefore, provides them with adequate lubrication.

Jackshaft 226 is so geared to timer motor 221 that it and the camscarried thereby make a com- I In this specific embodiment, centrifuge123 (Fig...

5) has an overall inside length of thirteen inches. The inside diameterof the base portion 126 is three inches, inside height of this portiontwo and three-sixteenths inches, inside diameter of upper portion 124 ofthe centrifuge one and onehalf inches, inside diameter of the overflowlip 125 one inch. Rundown tube 111 is of 6; inch bore and orifice 108 ofplug 101 is of inch bore. This centrifuge is operated successfully atabout 5000 R. P. M. with an output of five cups of finished beverage percycle. The centrifuge may, of course, be operated at higher or lowerspeeds, if desired, and the output per cycle may be increased ordecreased, depending upon the strength desired. With the cycle time andcycle output described, the amount of coffee introduced may be in theproportion of one pound of coffee to about cups of finished beverage orabout one pound of coffee to about 45 cups of finished beverage, or inany intermediate proportion.

We are now prepared to discuss the specific designs of the cams and camriders wherebythe requisite control is obtained. Referring to Figs. 20,21, 24 and especially 35, the function of cam 248 is to maintain theprecise cycle time of the apparatus and to insure that whenever startedin operation, it will continue to operate untilits full cycle iscompleted. Rider 241 is pivotally carried by shaft 231 while projection243 rides on the surface 244 of cam 24!]. Rider 241 is connected throughlink 245 to rocker 246 pivotally carried by shaft 232. Rocker 246carries mercury switch 234. By reference to Fig. 36 which is a diagramof the wiring circuit, it is seen that mercury switch 234 is in serieswith timer motor 221.

Thus, whenever timer motor 221 is started in operation, as by themicroswitch 164 control-led."

shown in Fig. 1.

cured to base 1, with rod 248. Arm 256 extends horizontally from rod248, its outer-end being displaceable between collars 251 and 258 onpush rod 110 (Fig. 1). Thus when'push rod 253 is lifted, arm 256 isdepressed and strikes collar.

258, thereby pressing downwardly upon push rod 110 and seating plug 109in orifice 108 (Fig. 5). Projection 250 will be about half-way up theinclined surface of cam 249 when projection 243 (Fig. 35) attains its'full lift. This insures that the load on timer motor 221 will bestaggered and that mixer outlet valve 105 will 'not be fully closeduntil the machine cycle has been definitely started. At the expirationof 42 seconds from the time of initial contact projection 258 runs offsurface 252 (Fig. 26) onto surface 259 by reason of the pull exerted byspring .268 connected between rider 251 and oil reservoir cover plate362.

runs off surface 258 (Fig. 26)-onto surface 261;

The further drop in push rod 253 causes arm 256 (Fig. 1) to contactwith'and lift collar 251,

thereby lifting the entire valve assembly 161 off of seat 105 and makingavailable the full discharge opening from the bottom of receptacleReturning to Figs. 20-24, the next cam in point of interest is 265. Adetail view of this cam is shown in Fig. 29. This cam controls theloperation of the mixer water inlet valve- 32 When projection 258. (Fig.26) has just attained its maximum lift, projection' 266 (Fig. 29) ofrider 261 carried by shaft 231 is about half-way up the surface 268 ofcam 265. Projection 266 continues to ride on surface 268 until 20seconds after the time of initial contact, whereupon projection 266 isreturned to surface 269 by the pull exerted by spring 264. Whileprojection 266 was in the elevated position, push rod 211 was lifted,thereby lifting connected yoke 212 (Fig. 1) and opening valve 32.

(Fig. 13). In a machine 'ofthe specific capacity described, orifice 184(Fig. 5) is so chosen that 32 is closed by the return of push rod 211and re- 5 mains closed until 57 seconds after initial contact whenprojection 266 runsg-up onto surface 213 13 (Fig. 29) of cam 265. Itcontinues to ride .011 this surface 273 until 67 seconds after the timeof initial contact, whereupon projection 266 runs down onto surface 214and valve 32 is again closed. From 2.5 to-3 cups of water will haveentered receptacle IOI during this period.

Having described the meansfor closing the mixer outlet valvev and forintroducing the water, itis now in order-t describe the means forintroducing the "ground coffee.

I have already described the dispenser (Figs. 1, l7 and 18) and howby amovement of rod 65 and bracket 64 in one directionthe hub 49 was turnedduring one operating cycle and how by the reverse movement of rod 65 andbracket 64 at the commencement of a succeeding cycle the bottom closureplate was moved horizontally to'uncover dispenser discharge'outlet 5I,therebydropping a batch. of coffee into receptacle IOI, These operationsare controlled by cam 280 (Figs. -24). A detailview of this cam appearsin Fig. 30. Roller 28I of rider 282 pivotally mountedron'shafti23l runsonsur'face 283 of cam 280. the outer end of which is developed as yoke28! (Fig. 31) to'hold pin-288'on-which double clevis 289ispivoted. Shaft65 extending through an orifice in base I (Figs- 1 and.30) and securedthereby againsttranslational movement is pivotally connected to saidclevis 289by yoke arm 290 ever, to make certain that hooks BI and I2(Fig.

18) make proper engagement respectively with gear 59 and pin I-I. At theexpiration of a machine cycle, cam'280 andrider'282 are in the positionsindicated in Fig. 30. When a machine cycle is started, roller 28I runsdown surface 29I of cam 280-. This obviously permits clevis 289 tomoveunder the actionof spring 285 (Fig. 1) (one end of which is connected toshaft 65 and the other to base I) in the reverse direction to thatindicated 'by'arrow 284. The corresponding movement of rod -65 (Figs. 1,1'7 and 18) operating through bracket 64 moves hook 6| to the positionshown in Fig. 18, thereby opening bottom closure plate I0 and 'droping acharge of cofiee from the dispenser. This operation takes place aftermixer outlet I05 (Fig. 5) has been fully closed. and before the waterfrom orifice I04 has been fully discharged so that the continueddischarge of this water may operate to drive" the coffee below thesurface of the water and to insurecomplete mixing. As hereinbeforepointed out accumulated in receptacle I'0I controls the operation ofcentrifuge motor 292.v

This motor operating through pulley 293 drives pulley I (Figs. land 5)of centrifuge I23 via V- belt I39. For this purpose motor 292'is'secured to leg '2 of base I (Fig. 1). Referring-to Fig-'28,i'ackshaft 226 carries cam 300. Gamrider 30! Rider 282 is provided withbell arm 286 (Fig.

1'4 pivotallylmountedon rod *23I has projection 302 which rides on thesurface of this cam- Rider SM is connected through linkv 304torocker'305 pivotally carried by shaft 232. Rocker 305gcarricsmercuryswitch 235. -As projection 302.rides.up onto the elevated portion 303 ofthis surface, link 304 changes the angle of rocker 305, thereby throwingmercury switch 235 carrieditherebyto the on-position. As is evident fromthe wiring diagram of. Fig-36, this switch is in series with andcontrols centrifuge motor 292. To bell arm306 (Fig.28) of rider 30I.there is pivoted link 3I4 the other end of which is pivotedaboutgpinfliprovided in yoke'3l5of. brake drum 30! (Figs. 24 and 28).Beioresswitch'235.reaches the on-position, link 3I4is retracted, therebypulling brake drum 301 and brake-surface 308 away from engage'mentwithrthe outside of lower section 12601 centrifuge I23 (Fig. 1). AsShown in 'Figs..22-'-24 brake drum 301 is'slidablycarried by rods- 309and 3H) mounted in uprights 228 "and 229. Springs 3II and 3I2 urgebrake-drum 30'! toward lower section I26 of centrifuge I23 .and 'asrsoonasproiection'302 rides oil of the'elevate'dsun face 303 thesespringsapply the brake 'and'arrest the rotation of the centrifuge;simultaneously spring 3I3 connected between rocker 305 and panel.2331returns mercury switch 235 to the of!- position, therebylkillingcentrifuge motor 292.

After centrifuge motor 292'and'centrifuge [.23 have stopped,rsufficienttime is allowed forthe material remaining in the centrifuge .to lose-itsrotational movement "and run out of the device throughdis'charge tubeI28 and waste 'pipe I33 Shortly thereafter receptacle IOI and centrifuge123 :are flushed out through spray nozzles II 8=and oriflces I98(Fig.-5) 'and'forthis' purpose flush control valve I3I is "actuated bypushing upwardlyvalve stem I92 (Fig. 1). To

: this end push rod 320(Fig. 1) is forced-upwardly so that collar 32Iborne by'the end thereof-is raised from'its seat on top ofsleeve'322:and actuates valve stem I92. The mechanismbywhich.

this is accomplished is shown in Figs. 32gand33 in a detailshowing ofpart of the construction of Figs. 1 and 20-24. Cam 330 mounte'd onshaft'226 defines a discontiued surface of progressivelyincreasingradius. As the cam-revolves, during'the machine cycle, it progressivelyforces upward lever 33I pivotally connected to spacer 328 on the side ofupright '229 '(Fi'gs.'21,'23 and "32) by pin 332. This upward movementcompresses coil spring -'333 positioned by retainers 346 :and'341against lever '334 which is also pivotally connected to said spacer 328by pin 335. Attentio'niis called to the fact that the pivot points oflevers'33I a-nd 334 do not lie in the same vertical plane (Flg.'32).Lever 334 cannot move upwardly because it is restrained by trigger336'pivotally connected to spacer 329 on the side of upright 229 (Figs.20 and'2l) byp-in 331. At the exact moment at which it is desired toactuate the flush valve, trigger 336 is forced off of the-end of lever334 by pin" 338, thereby releasing lever 334 and actuating push rod 320.The angular'divergence between levers 334 and 33I is, however, limitedby roller 339 rotatably supported by pin 340 in oversize bore 34 I. Leafspring-342 tends-to hold roller 339 in the position shown in'Fig. 34.Housing 343 carried bylever 33I supports pin 340 and spring 342. As soonas'the end'of lever 33I runs off of 'therelevated surface' 344 61 earn330 both levers 3'3I and-334 'drop'and'fiush control valve I9I isthereby closed, and upon'further rotation of cam 330 trigger 336is-re'setby means of spring 345 attached between said trigger and stub346. As the result of this construction the flush valve is either fullyon or full off, i. e., there is no intermediate period in which water isbeing discharged without a vigorous flushing effect and the total timethe valve is open may be closely determined by adjustment.

Next to be considered is the force-feed lubrication system for thecentrifuge bearings. Referring to Fig. 27, cam rider 350 pivotallycarried by shaft 23I has projection 35I which rides on the surface ofcam 352, mounted on shaft 226. The rotational movement of cam 352operating through'link 353 alternately raises oil pump piston 354. Thereverse movement of piston 354 is effected by spring 356. As can benoted from Fig. 27, there are four strokes of piston 354 during eachmachine cycle. These movements discharge oil from reservoir 35! throughside outlet 360 and tube I12 (Fig. 1) into annular space I10 (Fig. 5) inthe upper surface of centrifuge bearing I69. Oil returns to reservoir35'! from annular trough I'I9 (Fig. 5) through return line I82 (Fig. 1).Oil reservoir cover plate 362 is supported from base I by uprights 228and 229 (Figs. 20-24); and reservoir 351 is suitably secured to thebottom of said cover plate.

Referring to Fig. for a longitudinal vertical section through oilreservoir and cover plate 362, the reservoir may be periodicallyreplenished through fill pipe 363. The reservoir is provided with ariser 365 which is connected by duct 366 with the main body ofreservoir'351. If water finds its way into the oil reservoir, as, forexample, theresult of leakage, carelessness in cleaning, or possiblyleakage of steam into the main bearings, the water accumulates in thelower part of reservoir 351 and the oil is thereby lifted into risers368 and 310 until the compound head ofthe water and of the oil restingthereon counterbalances the hydrostatic head of a column of water inriser 365 extending up to outlet 364. Any further accumulation of wateris thenautomatically rejected through outlet 364 without at any timeinterfering with normal bearing lubrication. Piston 354 reciprocates inliner 369 provided in pump block 3', said liner extending upwardsthrough riser 368 (Fig. 25).

The cams illustrated are of suitable outline for a coffee makeroperating on an overall 90 second cycle with a production of 5 cups offinished beverage per cycle. The following are of approximate timesmaintained by a timer carrying such camsand which times have been foundentirely satisfactory.

Seconds after commencement of cycle 0 Mercury switch 234 and timer motorDetermined by projection 243 riding up onto surface 244 of cam 240 (Fig.35). 5 (a) Mixer discharge outlet I05 closes:

Determined by projection 250 riding up onto surface 252 of cam 249 (Fig.26). (1)) Mixed inlet valve 32 opens:

Determined by projection 266 riding up onto elevated surface 268 of cam,265' (Fig. .29). V

8 Dispenser outlet plate I0 opens:

Determined by roller 28! running down surface 29I of cam 280 (Fig. 30).

Seconds after commencement of cycle 14 Dispenser outlet plate I0 closes:

Determined by roller 28I running onto surface 283 of cam 280 (Fig. 30).Mixer inlet valve 32 closes:

Determined by projection 266 riding down off elevated surface 268 ontosurface 269 of cam 265 (Fig. 29). Mercury switch 235 and centrifugemotor 292 on:

Determined by projection 302 running up on elevated surface 303 of cam300 (Fig. 28). Mixer outlet orifice I08 (Fig. 9) opens:

Determined by projection 250 running off of elevated surface 252 ontosurface 259 of cam 249 (Fig. 26) Mixer inlet valve 32 opens:

Determined by projection 266 riding up onto elevated surface 213 of cam265 (Fig. 29). Mixer inlet valve 32 closes:

Determined by projection 266 riding down onto surface 214 of cam 265(Fig. 29).

motor 292 off and brake 30'! applied:

Determined by projection 302 running off of elevated surface 303 of cam300 (Fig. 28) Mixer discharge outlet I05 opens:

Determined by projection 250 running off of surface 259 onto surface 26Iof cam 249 (Fig. 26). Flush valve I9I opens:

Determined by pin 338 of cam 330 releasing lever 334 from engagementwith trigger 336 (Fig. 32). (a) Flush valve I9I closes:

Determined by lever 33I running down off of elevated surface 344 of cam330 (Fig. 32). (1)) Mercury switch 234 and timer motor 221 off:

Determined by projection 243 running on of surface 244 downonto surface242 of cam 240 (Fig. 35).

The times for the actuation of oil pump 355 are not critical. It is,however, desirable to introduce the first slug of oil before centrifugemotor 292 is started.

The operation of my improved coffee maker will be evident from theforegoing description. As soon as the machine is up to temperaturewhichwill be evident from the appearance of steam' at the waste pipe I33(Fig. 5) therebyshowing that the water in tank 3 is up to the boilingpoint and that the centrifuge is at a temperature of 100 C., the machineis ready to operate. The dispenser should be charged with ground coffeeand for this purpose a relatively fine grind of the order of a corn-mealgrind will be found satisfactory. The machine will continue to operateso long as the circuit controlling timer motor 221 is energized by floator manually con-' trolled microswitch I64 (Fig. 36). The residue ofcoffee grounds rejected from waste pipe I33 may be discharged in anysuitable manner. The

preferred practice in this regard is to drop the Mercury switch 235 andcentrifuge eflluent directly into a waste pipe communicating with thesewer.

The foregoing description is furnished by way of illustration and not oflimitation, and it is, therefore, my intention that the invention belimited only by the appended claims or their equivalents wherein I haveattempted to claim broadly all inherent novelty.

I claim:

1. In a coffee maker having a timer controlled extraction and separatingsystem of the kind including a centrifuge of the imperforate overflowself-dumping type, a receptacle for comingling hot water from asubstantially continuous hot water supply with ground roasted coffee, arundown tube extending from said receptacle into said centrifuge, theimprovement in combination with such system of fiow control meansincluding means defining an orifice in the upper end of said rundowntube of lesser diameter than said rundown tube, the diameters of saidorifice and of said rundown tube being so coordinated that on rundown asolid column of liquid is maintained in said rundown tube and flowthrough said orifice is a function of the total height of the column ofliquid in said receptacle and in said tube.

2. In a coffee maker the improvement in accordance with claim 1 in whichsaid fiow control means include a valve at the upper end of said rundowntube controlling fiow into said rundown tube, in which said orifice isdefined by said valve, in which means are provided for opening andclosing said orifice and in which further means are provided operativelyconnected to the timer of said system to sequentially open said orificeand said valve and to close said orifice and said valve.

3. In a coffee maker having a timer controlled extraction and separatingsystem of the kind including a centrifuge of the imperforate overfiowself-dumping type, a receptacle for co-minglin hot water from asubstantially continuous hot water supply with ground roasted cofiee, arundown tube extending from said receptacle into said centrifuge, theimprovement in combination with such system of fiow control meansincluding means defining a seat at the upper end of said rundown tube, aplug cooperating with said seat, an orifice defined by said plug oflesser diameter than said rundown tube, and means operatively connectedto the timer of said system to sequentially open said orifice, to liftsaid plug and to close said orifice and to lower said plug.

4. The improvement in claim 3 in which the diameters of said orifice andsaid rundown tube are so coordinated that on rundown a solid column ofliquid is maintained in said rundown tube and fiow through said orificeis a function of the total height of the column of liquid in saidreceptacle and in said tube.

5. In a coffee maker having a timer controlled extraction and separatorsystem of the kind involving a centrifuge of the imperforate overflowself-dumping type, a receptacle for co-mingling hot water from asubstantially continuous hot water supply with ground roasted coffee, arundown tube extending from said receptacle into said centrifuge, theimprovement in combination with such system of fiow control meansdefining fice defined by said valve of lesser diameter than said rundowntube, means adapted to open and close said orifice and means operativelyconnected to the timer of said system to sequentially open said orificeand said valve and to close said orifice and valve, and means fordischarging jets of water against the interior of said receptacle.

6. The improvement in accordance with claim 5 in which said valveincludes a seat at the upper end of said rundown tube and a plugcooperating with said seat, in which said orifice is defined by saidplug and is of lesser diameter than said rundown tube, in which saidmeans operatively connected to said timer sequentially opens saidorifice, lifts said plug and closes said orifice and lowers said plug.

7. The improvement in accordance with claim 6 in which the diameters ofsaid orifice and said rundown tube are so coordinated that on rundown asolid column of liquid is maintained in said rundown tube and fiowthrough said orifice is a function of the total height of the column ofliquid in said receptacle and in said tube.

8. A coffee maker according to claim 1 including a screen in saidreceptacle surrounding said orifice.

9. A coffee maker according to claim 1 including a frustro-conicalscreen in said receptacle surrounding said orifice.

10. A coffee maker according to claim 3 including a screen in saidreceptacle surrounding said orifice.

11. A coffee maker according to claim 3 including a frustro-conicalscreen in said receptacle surrounding said orifice.

12. A coffee maker according to claim 5 including a screen in saidreceptacle surrounding said orifice.

13. A coffee maker according to claim 5 including a frustro-conicalscreen in said receptacle surrounding said orifice.

LOUIS BURGESS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 346,044 Hopkins July 20, 18861,268,858 Lewis June 11, 1918 1,467,170 Kelly Sept. 4, 1923 1,602,632Zorn Oct. 16, 1926 1,665,728 Canright Apr. 10, 1928 1,709,657 ClintonApr. 16, 1929 1,789,334 Englung Jan. 20, 1931 1,837,368 Medin Dec. 22,1931 1,869,720 Strand et al Aug. 2, 1932 1,962,494 Ferris June 12, 19341,963,476 Smith June 19, 1934 2,112,612 Theofilos Mar. 29, 19382,149,270 Burgess Mar. 7, 1939 2,194,807 Oyen et al Mar. 26, 19402,264,837 Gavin et a1 Dec. 2. 1941 2,314,018 Sanderson Mar. 16, 19432,392,452 Baumann Jan. 8, 1946 FOREIGN PATENTS Number Country Date 2,376Germany Oct. 10. 1900

